Environmental Specifications; Noise; Other Specifications; Cooling System - HP FlexFabric 7900 Series Installation Manual

Environmental specifications

Table 12 Environmental specifications
Item
Temperature
Relative humidity
(noncondensing)

Noise

The switch uses fans with the automatic speed adjustment function, so the sound pressure levels vary by
fan speed. For more information, see
Table 13 Sound pressure levels
Model
HP 7904 (two fan trays)
NOTE:
The sound pressure levels are measured according to the method specified in ISO 7779 at the bystander
position.

Other specifications

Table 14 Other specifications
Model
HP 7904

Cooling system

The cooling system of the switch comprises the air vents in the chassis, fan tray, and built-in fans of power
supplies. To guarantee the performance of this cooling system, consider the ventilation design for the
installation site when you choose a fan tray assembly and plan the installation site for the switch.
• When a back-to-front airflow fan tray (JG839A) is used, ambient air flows in through the air vents
in the fan tray panel and the power supply panels, circulates through the chassis and the power
supplies, and exhausts at the port side, as shown in
Operating environment
0°C to 40°C (32°F to 104°F)
5% to 95%
Table
Sound pressure level under room
temperature
59.8 dB
System leakage current
standard
EN60950-1
GB4943
IEC60950-1
UL60950-1
Non-operating environment
–40°C to +70°C (–40°F to +158°F)
5% to 95%
13.
Sound pressure level when the fan
tray operates at full speed
76.3 dB
Fusing current
15 A
Figure 40.
44
Fireproofing standard
EN60950-1
GB4943
IEC60950-1
UL60950-1